Biological Oxygen demand (BOD) is used as a standard measure of

Options :
  1. Oxygen level in forest System
  2. Oxygen level in animals
  3. Oxygen level in water system
  4. Oxygen level in atmosphere


Answer and Explanation :-

Answer: Option 3

Explanation:

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We pass through this world but once. Few tragedies can be more extensive than the stunting of life, few injustices deeper than the denial of an opportunity to strive or even to hope, by a limit imposed from without, but falsely identified as lying within.
-Stephen Jay Gould The Mismeasure of Man